Evidence for quasi-static scission configurations obtained from long range particle accompanied fission distributions

Guet, C.; Signarbieux, C.; Perrin, Paul B.; Nifenecker, H.; Leroux, B.; Asghar, M. I.

doi:10.1051/jphyslet:019780039013021300

Cited by 6 publications

(3 citation statements)

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“…Sinha and Mehta [11] have calculated the angular distribution of the long range α particle in the fission of 252 Cf. They could reproduce the experimental results of Guet et al [12] by considering the distance between two main fission fragments D to be less than 20.5 fm as an initial condition in their calculation. In a later work [13], with an improved model, they performed calculations to derive the information on the scission point configuration of spontaneous fission of 252 Cf .…”

Section: Introductionmentioning

confidence: 60%

“…It has been concluded that the Lagrange scenario can describe the α accompanied cold ternary fission process. They have done similar calculations for other light charged particles viz., 10 Be and 12 C in the fission of 252 Cf [17]. They reported that the energy and angular distributions strongly depend on the mass asymmetry and the initial position of the third fragment with respect to the two main fission fragments.…”

Section: Introductionmentioning

confidence: 99%

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Equatorial, collinear trajectories in the ternary fission of ²⁵²Cf for various third fragments

Vijayaraghavan

Lakshmi

Prema

et al. 2019

J. Phys. G: Nucl. Part. Phys.

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To understand the dynamics of the ternary fission process, trajectory calculations play an important role. Within the classical physics concept, the trajectories of the fragments in a spontaneous ternary fission of Cf are studied. Taking into account the conservation laws, the force acting between the fragments dictates the future path. A good set of parameters needed for the initial configuration can be designed from the known experimental information on the angular and energy distributions of the ternary fission fragments. Else, various initial parameters can be tuned to obtain the desired final results to match with the experimental angular and energy distribution of the fragments. Initial parameters such as the distance between the fission fragments, velocity and position of the fragments are chosen from the earlier theoretical and experimental studies. The kinetic energy and position of the fragments are calculated numerically for different ternary fission fragments. The results indicate that the final angle of the light third fragment is almost around 90°, and it is independent of the initial angle having a preference for equatorial and/or orthogonal emission of third fragments with respect to the other two fission fragments. For heavier third fragments, a strong dependence on the initial angle is seen in the final emission direction, which for very low angles results in collinear type trajectories, supporting the experimental observation of collinear cluster tripartition.

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Section: Introductionmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Equatorial, collinear trajectories in the ternary fission of ²⁵²Cf for various third fragments

Vijayaraghavan

Lakshmi

Prema

et al. 2019

J. Phys. G: Nucl. Part. Phys.

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“…1 D6partement de Recherche Fondamentale, CEN-Grenoble, Cedex 85, F-38000 Grenoble, France 2 Institut Laue-Langevin, 156X, F-38042 Grenoble-Cedex, France 3 Division Physique CCR, EURATOM, 1-21020 Ispra, Italie Present address: Gesellschaft fiir Schwerionenforschung, Postfach 110541, D-6100 Darmstadt, Federal Republic of Germany A systematic study [3][4][5] of light-charged-particleaccompanied fission has been undertaken using the very intense neutron beams available at the Grenoble high flux reactor. The present work is devoted to the low energy part of the e-particles energy spectrum for which the experimental results are very scarce (in most experiments, the light-charged-particle detector is shielded against fission fragments) and contradictory.…”

Section: Introductionmentioning

confidence: 99%

The thermal-neutron-induced alpha-accompanied fission of235U investigation of the low energy part of the alpha spectrum

Caïtucoli¹,

Leroux

Barreau

et al. 1980

Z Physik A

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The energy spectrum of the e-particles emitted in the thermal-neutron induced fission of 235U was measured from 11.5 MeV down to 2 MeV using the parabola mass spectrometer Lohengrin at the I.L.L. high flux reactor. This low energy part of the energy spectrum presents a smooth connection with the energy spectra which have been recently reported above 7 MeV. The overall energy spectrum, which is known to be quasi-gaussian above 12 MeV, is slightly asymmetric at low energy, where the observed particles are 6 % more than expected from a gaussian shape. As a consequence, all the values reported for 235U for the rate of e-accompanied fission compared to binary fission have to be multiplied by 1.06. This asymmetry is about 2 times less important than the one reported for 252Cf. No evidence was seen for any intense low energy component as reported before. The possible reasons for the existence of this asymmetry are discussed.

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Heavy Ions and Nuclear Fission

Oganessian

Lazarev

1985

Treatise on Heavy-Ion Science

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Gu 8Ib, He 82b, Mu 82a, Sc 8Ib,c, Wi 82). The open circles indicate the experimental T"c values for 236U, 240pU, 250Cf as well as for a number of even A isotopes of Fm and element 104. Further details are the same as in the left-hand part of the figure..... N ~ :I . ~ t ~ [ ~ :I. ~ ~ ~ .., t Recently it has been found (Dc 84b) that the even-even millisecond isotope 26°106 also possesses quite a strong alpha-decay branch. The partial spontaneous fission half-life of 26°106 has been estimated to be 5 X 10-3 S or more; this 1',,[ value is not smaller than that of the isotope 256 104. See also Note added in proof.t The normalization of the liquid-drop model expression for 1',,[ = f( x) is achieved by an appropriate choice, for 236U, of the average value of the hydrodynamic effective inertia along the fission trajectory; then, in passing to heavier nuclei, this value is scaled in accordance with a "hydrodynamic" factor A 5 / 3 So, an attempt to compensate an underestimate of 1',,[ of the order of 10 15 at the expense of the effective inertia alone would signify a need for increasing the latter by tens of times in passing from 236U to 262 107, where the total number of nucleons A increases by 10% only.

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Evidence for quasi-static scission configurations obtained from long range particle accompanied fission distributions

Cited by 6 publications

References 10 publications

Equatorial, collinear trajectories in the ternary fission of ²⁵²Cf for various third fragments

Equatorial, collinear trajectories in the ternary fission of ²⁵²Cf for various third fragments

The thermal-neutron-induced alpha-accompanied fission of235U investigation of the low energy part of the alpha spectrum

Heavy Ions and Nuclear Fission

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Evidence for quasi-static scission configurations obtained from long range particle accompanied fission distributions

Cited by 6 publications

References 10 publications

Equatorial, collinear trajectories in the ternary fission of 252Cf for various third fragments

Equatorial, collinear trajectories in the ternary fission of 252Cf for various third fragments

The thermal-neutron-induced alpha-accompanied fission of235U investigation of the low energy part of the alpha spectrum

Heavy Ions and Nuclear Fission

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Product

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Equatorial, collinear trajectories in the ternary fission of ²⁵²Cf for various third fragments

Equatorial, collinear trajectories in the ternary fission of ²⁵²Cf for various third fragments